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IoT 하드웨어

StringCchPrintfEx function

Writes formatted data to the specified string. The size of the destination buffer is provided to the function to ensure that it does not write past the end of this buffer.

StringCchPrintfEx adds to the functionality of StringCchPrintf by returning a pointer to the end of the destination string as well as the number of characters left unused in that string. Flags may also be passed to the function for additional control.

Syntax

Parameters

pszDest [out]

Type: LPTSTR

The destination buffer, which receives the formatted, null-terminated string created from pszFormat and its arguments.

cchDest [in]

Type: size_t

The size of the destination buffer, in characters. This value must be sufficiently large to accommodate the final formatted string plus 1 to account for the terminating null character. The maximum number of characters allowed is STRSAFE_MAX_CCH.

ppszDestEnd [out, optional]

Type: LPTSTR*

The address of a pointer to the end of pszDest. If ppszDestEnd is non-NULL and any data is copied into the destination buffer, this points to the terminating null character at the end of the string.

pcchRemaining [out, optional]

Type: size_t*

The number of unused characters in pszDest, including the terminating null character. If pcchRemaining is NULL, the count is not kept or returned.

dwFlags [in]

Type: DWORD

One or more of the following values.

Value

Meaning

STRSAFE_FILL_BEHIND_NULL

0x00000200

If the function succeeds, the low byte of dwFlags (0) is used to fill the uninitialized portion of pszDest following the terminating null character.

STRSAFE_IGNORE_NULLS

0x00000100

Treat NULL string pointers like empty strings (TEXT("")).

STRSAFE_FILL_ON_FAILURE

0x00000400

If the function fails, the low byte of dwFlags (0) is used to fill the entire pszDest buffer, and the buffer is null-terminated. In the case of a STRSAFE_E_INSUFFICIENT_BUFFER failure, any truncated string returned is overwritten.

STRSAFE_NULL_ON_FAILURE

0x00000800

If the function fails, pszDest is set to an empty string (TEXT("")). In the case of a STRSAFE_E_INSUFFICIENT_BUFFER failure, any truncated string is overwritten.

STRSAFE_NO_TRUNCATION

0x00001000

As in the case of STRSAFE_NULL_ON_FAILURE, if the function fails, pszDest is set to an empty string (TEXT("")). In the case of a STRSAFE_E_INSUFFICIENT_BUFFER failure, any truncated string is overwritten.

pszFormat [in]

Type: LPCTSTR

The format string. This string must be null-terminated.

... [in]

The Arguments to be inserted into the pszFormat string.

Return value

Type: HRESULT

This function can return one of the following values. It is strongly recommended that you use the SUCCEEDED and FAILED macros to test the return value of this function.

Return code

Description

S_OK

There was sufficient space for the result to be copied to pszDest without truncation and the buffer is null-terminated.

STRSAFE_E_INVALID_PARAMETER

The value in cchDest is either 0 or larger than STRSAFE_MAX_CCH, or the destination buffer is already full.

STRSAFE_E_INSUFFICIENT_BUFFER

The copy operation failed due to insufficient buffer space. Depending on the value of dwFlags, the destination buffer may contain a truncated, null-terminated version of the intended result. In situations where truncation is acceptable, this may not necessarily be seen as a failure condition.

Note that this function returns an HRESULT value, unlike the functions that it replaces.

Behavior is undefined if the strings pointed to by pszDest, pszFormat, or any argument strings overlap.

Neither pszFormat nor pszDest should be NULL unless the STRSAFE_IGNORE_NULLS flag is specified, in which case both may be NULL. However, an error due to insufficient space may still be returned even though NULL values are ignored.

StringCchPrintfEx can be used in its generic form, or in its more specific forms. The data type of the string determines the form of this function that you should use.